Postman / Newman retry in case of failure

You can setup a request workflow like this:

Create a collection with a request, then:

In the pre-request tab you can implement a counter:

// Counter for number of requests
var counter = environment.counter ? _.parseInt(environment.counter) + 1 : 1;
postman.setEnvironmentVariable("counter", counter);

Your tests tab would look like this:

const code = (responseCode.code === 200);

if (code === 200 && environment.counter < X) {
    // Stop execution
    tests["Status code is 200"] = code;
    postman.setNextRequest();
}
else {
    // retry the same request
    postman.setNextRequest("Name of this request");
}

A timeout for the request itself can be configured with the newman CLI:

newman run myCollection.json --timeout-request Y

After few hours I had ended up with a function like this:

    function retryOnFailure(successCode, numberOfRetrys) {
        var key = request.name + '_counter';
        var execCounter = postman.getEnvironmentVariable(key) || 1;

        var sleepDuration = 1000;
        var waitUntilTime = new Date().getTime() + sleepDuration;
        if (responseCode.code !== successCode && execCounter <= numberOfRetrys) {
            while (new Date().getTime() < waitUntilTime) {
                // Do Nothing -> Wait
            }
            console.log('Retrying: ' + request.name + '\nGot: ' + responseCode.code + ' Expected: ' + successCode + '\nWaited: ' + sleepDuration / 1000 + 'sec  \nRetry Number: ' + execCounter + ' of ' + numberOfRetrys);
            execCounter++;
            postman.setEnvironmentVariable(key, execCounter);
            postman.setNextRequest(request.name);
        }
    }

Usage:

    retryOnFailure(404, 4);